\\[-1.8ex] Soil Heterogeneity & $-$0.044$^{**}$ & $-$0.046$^{**}$ & $-$0.043$^{**}$ & $-$0.048$^{**}$ \\ 
  & (0.022) & (0.021) & (0.021) & (0.021) \\ 
\\[-1.8ex]
Dependent Variable Mean & 0.63 & 0.63 & 0.64 & 0.64 \\ 
Dependent Variable SD & 0.21 & 0.20 & 0.21 & 0.20 \\ 
Observations & 23,431 & 23,442 & 23,437 & 23,445 \\ 
R$^{2}$ & 0.813 & 0.796 & 0.817 & 0.805 \\ 
